If the first September 2010 numbers to trickle out are any indication, the fashion magazines seem to be getting off their diets. Glamour, one of the most reliable cash cows at Condé Nast, is reporting that its ad pages are up 57 percent for the month: 241 ad pages for September 2010 compared with 153 for a year earlier …

“People that had taken a break last year are coming back,” said William J. Wackermann, a Condé Nast senior vice president and the publishing director of Glamour, Brides, Details and W.

Mr. Wackermann said he had seen more interest from a broad array of advertisers, whether beauty companies like L’Oréal or financial companies like Chase and American Express.

Next month, Mr. Wackermann will ship the biggest Glamour in 20 years, his 400-page September issue.He attributed the success to a cross-platform sales effort — iPad-print synergy!

Vogue‘s September numbers are coming out later today. We’re going to guess: more good news.